Patents by Inventor Mark R. Parker

Mark R. Parker has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Apparatus and method for controlling coalescence of ink drops on a print medium
    Patent number: 5600352
    Abstract: An image transfer ink-jet printer (10) employs an image receiving drum (12) that rotates relative to a ink-jet array print head (26) spanning the full width of the drum. An encoder disk (70) is coupled to the drum to coordinate ink drop ejection with precise angular rotational increments of the drum. The encoder disk has an alternating transparent/opaque pattern with a pitch that is one-half the desired resolution of the printer. A photo-optical detector (72) senses the alternating pattern and sends an asymmetrical signal to a duty-cycle correction circuit (140) that generates a symmetrical signal having a frequency double the one received from the photo-optical detector.
    Type: Grant
    Filed: June 27, 1994
    Date of Patent: February 4, 1997
    Assignee: Tektronix, Inc.
    Inventors: David L. Knierim, Mark R. Parker